diff --git a/TODO b/TODO
index 8bb8588..dacaa1a 100644
--- a/TODO
+++ b/TODO
@@ -10,6 +10,10 @@
   __HOSTSHORT__  # Leftmost component of hostname as passed to program
   __TIME__       # Time in HHMMSS format
 
+- Test mode now expands variable references to their values for
+  all variables except the builtins above (which are only
+  evaluated at runtime).
+
 - Added an "execution variable".  This runs a command of your
   choosing (on the local machine) and assigns the results to
   a user-defined variable.